Offset overlapping slot line antenna apparatus
an offset and slot line technology, applied in the field of antennas, can solve the problems of small periodic variations in the tapered clearance shown by mccorkle, inability to control the impedance of the antenna and implement the desired transfer function in the antenna, and inability to achieve significant manipulation of the antenna transfer function, etc., to achieve the effect of reducing the amount of impedance and reducing the need for filtering capability
Inactive Publication Date: 2008-10-21
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Benefits of technology
This approach enables efficient filtering capabilities in ultra-wideband antennas, effectively rejecting higher frequency interferers while maintaining performance within the desired band, and does so without increasing costs or board space.
Problems solved by technology
In practice, the small periodic variations in tapered clearance shown by McCorkle are largely ineffective in giving rise to significant manipulation of an antenna transfer function, particularly since the disclosed variations maintain a continuous increase in width.
This technique has not been applied to control impedance of antennas and implement desired transfer functions in antennas, however.
The extreme bandwidths of ultra-wideband antennas leave them especially vulnerable to interferers.
It is a challenge to design an RF-front end to provide sufficient rejection to adjacent interferers just above an antennas operating band without adversely impacting performance in a desired band.
Making such an antenna unresponsive to higher frequency signals is a greater challenge.
Method used
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Preferred Embodiment
[0041]FIG. 4 is a schematic diagram 400 depicting a preferred embodiment spectral control magnetic slot antenna 461 according to the teachings of the present invention. A first conducting surface 413 on a front side of a dielectric substrate 407 and a second conducting surface 415 on a back side of a dielectric substrate 407 cooperate to form complex tapered slot 417. Complex taper slot 417 is an example of an offset slot line, in which conducting surfaces (like first conducting surface 413 and second conducting surface 415) on opposing sides of a dielectric (like dielectric substrate 407) cooperate to form a transmission line structure defining a signal path. A plurality of first vias 419 and a plurality of second vias 421 electrically couple first conducting surface 413 to second conducting surface 415 in the vicinity of first open termination 409 and second open termination 411, respectively. In alternate embodiments, first conducting surface 413 may be electr...
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An offset overlapping slot line comprises a first metallization on a first side of a dielectric substrate and a second metallization on a second side of a dielectric substrate cooperating to yield a transmission line. By overlapping the first and second metallizations, one may achieve much lower impedance than in traditional slot line transmission line structures. An offset overlapping slot line antenna apparatus incorporates an offset overlapping slot line in a feed region. This has the benefit of yielding a low input impedance. A low input impedance allows a transmit antenna to bed driven efficiently even by low voltage, high current drivers. Also a low input impedance can help reduce thermal noise in a received front-end. This technique is well suited for application to dipole, monopole, slot, and annular slot antennas, to name a few examples.
Description
[0001]The present application is a continuation-in-part of a U.S. patent application titled: “Spectral control antenna apparatus and method,” filed Oct. 15, 2004, Ser. No. 10 / 965,921, published as Pub. No. U.S. 2005 / 0151693 A1 by Schantz. This application further claims benefit under 35 USC 119(e) of prior filed co-pending Provisional Patent Application Ser. No. 60 / 512,872 filed Oct. 20, 2003.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to antennas and more specifically to planar broadband antennas incorporating an overlapping offset slot line.[0004]2. Description of the Prior Art[0005]Practitioners of the antenna arts have long realized that a tapered antenna feed leads to an improved broadband match. Early examples of such antennas include those of Carter [U.S. Pat. No. 2,181,870], and Brillouin [U.S. Pat. No. 2,454,766]. These concepts have been applied to planar antennas as well, notably by Nester [U.S. Pat. No. 4,500,887] who tau...
Claims
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IPC IPC(8): H01Q13/10H01Q1/38
CPCH01Q1/38H01Q13/10
InventorSCHANTZ, HANS GREGORY
OwnerNEXT RF